Did Thor: The Dark World secretly confirm this Avengers 4 Quantum Realm theory? Watch Thor movies free

Under its president Kevin Feige, the Marvel Cinematic Universe has developed into one of the most tightly interwoven storytelling experiments ever committed to film. But could a seemingly throwaway conversation way back in 2013's Thor: The Dark World reveal a clue as to how the superheroes will undo Thanos' Infinity Snap in 2019's Avengers 4?…